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llnitril genes HENRY TAYLOR AND JOSEPH M. COALE, Oli-BALTIMORE, WARYLAND.

Letters Patent No. 96,999, dated November 16,'1869.

-*OOP*- SAFE 'PY-VALVE.

The Schedule referred to in these Letters Patent and making part of the same.

vTo all whom fit may concern Be it known that we, HENRY TAYLOR and J osEPH M. COALE, of the city of' Baltimore, in tlieState of Maryland, have invented certain new and useful Improvements in Steam-Generator Safety-Valves; and we do hereby declare the following to be a full, clear, and exact desciiption of the same, reference beinghad to the accompanying drawings, making a part of this the several separate figures, denote like parts of the safety-valve and its connections, in all of the drawin The safety-valve herein shown is more especially arranged for locomotive-engines, where a weight is not so steady under the motion or jars of locomotion as a spring is; and

Our invention consists in combining two valves, of

unequal areas, with a lever, spring, and regulatingmechanism, so that, whilst the engineer may blow off the steam from the boiler at pleasure, lie cannot preveiit it from blowing oft whenever it rises above the pressure for which the valve has been set.

To enable others skilled in the art to make and use our invention, we will proceed to describe the same with reference to the drawings.

rlhe valve being attached to the boiler, and the passage A being in communication with the steam therein, the pressure of the steam, at its regulated point, forces the valve B to its seat, and prevents any steam from escaping; but whenever the pressure rises above that which it is designed to carry in the boiler, it raises vthe small valve C, and admits the steam into the chamber D and upon the upper head E, of the valve B,Wliicli is of greater area than the valve, and forces down said valve l, and allows the steam to escape through F. i

iVlien the pressure iu the boiler is reduced to that which -has been designated by the tension of the spring, or for which it nia-y be set, then the valve C is closed, by thc action of the spring, cutting oft' the steam from the chamber D. i

This donc, thc steam in the boiler shuts the valve B, and there is no more escape, until the pressure again becomes greater than the regulated quantity.

The spring, and its appliances, by which the exact are arranged and operate as follows:

One end of the coiled spring G is `fastened to a projection, H, on the top plate I. The inner coil oil the spring terminates in a square opening, tlirongli which the square part c of the bolt J passes, and so that said spring may bc further coiled or strained by said bolt.

On the square portion ot the bolt J, thc arms or lugs b b, of the lever K, are also placed, so that the pressure or force of said spring shall be exerted through said lever K, and through the stem or post L, to the holding down and closing the small valve C.

Upon the round portions of the bolt J, and outside of the lugs b, the hubs c, of a forked lever, M, are placed, said lever, except in the length of its pressing-arm, being substantially similar to that one, K.

Through the linbs c, ofthe lever M, are set-screws, :l el, by which said hubs and the lever may be fastened to the bolt J.

Through the point c, of' the lever M, a set-screw, f, passes, the point of which latter bears upon the stein or arm of the lever K.

By this arrangement ot' levers and springs, an ap` proximation to the amount of steam or pressure that the boiler is to carry, i's made through the spring and lever K, and the exact pressure by the thumb-nut or screw f, so that the utmost accuracy is attained in fixing the amount of pressurc,'whilst any excess over that amount esca-pes of itself', and the engineer-'cam not stop or prevent such escape.

The valve, spring, and levers arc arranged under a case, or cover N, inaccessible to thc origineel', except by force. But by means of a shaft, y, passing through the case, and a cam-arm, h, upon it, iiiside of the case, anda crank, 0,011 the outside there of, the engineer can raise the lever K, and allow the steam to blow ofi', thc whole of it, if so dcsircd, but he cannot carry a pound, or fraction oi' a pound, over and .ahovc what the boiler aiidvalve are set to carry.

Two guide or gauge-pins, 41' i, are arranged to catch the ci'aiik-aiiii O, at the proper position to hold it there, and a through-bolt, l), holds the caso N tightly together, it heilig cast in halves or sections.

' The spriiigjj is for holding the valve B on its scat, or shut, before or whilst steam is making, which, when made, then does that work.

We liavc described the devices exactly as we iiiid them to act well, and be inlyipensive in construction and fitting.

The devices may be changed or refined wit-hout varying the result or inode of operation.

Having thus fully described our invention,

X'Vhzit We Claim therein as new, and desire to secure above the 'lesignated pressure, substantially as and by Letters Patent, is-

The combination of the t v0 valves, one large and the other small, with the coiled spring, and the bearing-levers and steam-Ways, so that the valve sha-l1 be Witnesses:

W. H. HAYWARD, L. R. WOO'LLEN.

for the purpose described and represented.

HENRY TAYLR. J. M. COALE.

held shut when the steam is below the 'regulated pressure, and opened by the steam when it rises 

